你把完整代码发出来看看
if(!this.IsPostBack) { SqlConnection meteor = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["meteor"]); meteor.Open(); SqlCommand comm = new SqlCommand("select * from studentinformation", meteor); SqlDataReader sdr = comm.ExecuteReader(); ListBox1.DataSource = sdr; ListBox1.DataTextField = "studentname"; ListBox1.DataValueField = "studentnum"; ListBox1.DataBind(); sdr.Close(); meteor.Close(); }